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<dc:title xml:lang="fr">Influence des cytokines immunitaires sur la mégacaryocytopoïèse et l'homéostasie des plaquettes sanguines : rôle de l'interleukine 21</dc:title>
<dcterms:alternative xml:lang="en">Effect of immune cytokines on megakaryocytopoiesis and platelet homeostasis : role of interleukin 21</dcterms:alternative>
<dc:subject xml:lang="fr">Mégacaryocytopoïèse</dc:subject>
<dc:subject xml:lang="fr">Plaquettes</dc:subject>
<dc:subject xml:lang="fr">IL-21</dc:subject>
<dc:subject xml:lang="fr">Lymphocytes</dc:subject>
<dc:subject xml:lang="en">Megakaryocytopoiesis</dc:subject>
<dc:subject xml:lang="en">Platelets</dc:subject>
<dc:subject xml:lang="en">IL-21</dc:subject>
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<tef:elementdEntree autoriteExterne="027827577" autoriteSource="Sudoc">Hématopoïèse</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="032032935" autoriteSource="Sudoc">Facteurs de croissance hématopoïétique</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027570401" autoriteSource="Sudoc">Immunité cellulaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029066751" autoriteSource="Sudoc">Thrombocytopénie</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La mégacaryocytopoïèse est le processus de différenciation des cellules souches hématopoïétiques en mégacaryocytes produisant les plaquettes sanguines. Des données de transcriptome indiquent la présence des récepteurs aux interleukines (IL) -10, -17A et -21 sur les mégacaryocytes. Mon travail montre que les IL-10 et -17 n’ont pas d’effet apparent sur la prolifération et la différenciation in vitro des mégacaryocytes à partir des progéniteurs hématopoïétiques humains CD34+. Cependant, l’IL-21 augmente la prolifération des progéniteurs mégacaryocytaires dérivés de ces cellules et sans modifier leur différenciation. Les mégacaryocytes de la moelle osseuse humaine expriment aussi le récepteur à l’IL-21, ce qui suggère un rôle direct de l’IL-21 sur la mégacaryocytopoïèse in vivo. De façon concordante, l’expression de l’IL-21 chez la souris stimule la mégacaryocytopoïèse ainsi que la production des plaquettes, mais augmente la clairance des plaquettes par les macrophages. Ces travaux suggèrent que durant les réponses immunitaires, l’expression de l’IL-21 par les lymphocytes T CD4+ activés module l’homéostasie des plaquettes sanguines.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Megakaryocytopoiesis is the process by which hematopoietic stem cells give rise to megakaryocytes which in turn produce blood platelets. Transcriptional studies indicate the presence of interleukin (IL) -10, -17 and -21 receptors on megakaryocytes. This work shows that IL-10 and -17 have no apparent effect on in vitro proliferation and differentiation of megakaryocytes derived from human CD34+ hematopoietic progenitors. However, IL-21 increases the proliferation of megakaryocyte progenitors derived from these CD34+ cells without modifying their differentiation. Moreover, human bone marrow megakaryocytes express IL-21 receptor, suggesting a direct role of IL-21 on megakaryocytopoiesis in vivo. Concordantly, IL-21 expression in mice stimulates megakaryocytopoiesis and platelet production, but increases platelet clearance by macrophages. This work suggest that during immune responses, the expression of IL-21 by activated CD4+ T lymphocytes modulate blood platelet homeostasis.</dcterms:abstract>
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